The TBM_SETPOS message sets the current position of the slider in a trackbar.
TBM_SETPOS
wParam = (WPARAM) (BOOL) fPosition;
lParam = (LPARAM) (LONG) lPosition;
Parameters
fPosition
Position flag. If this parameter is TRUE, the message sets the slider to the position given by lPosition. Otherwise, the message ensures that the current position is within the current minimum and maximum positions, but it does not move the slider.
lPosition
New position of the slider.
Return Values
No return value.